Double seal redundant structure high safety cut-off check valve

Abstract

The application discloses a kind of double sealing redundancy structure high security cut-off check valve, relating to cut-off check valve technical field, including lower check valve and upper check valve, the upper surface of the lower check valve is fixedly connected with first circular block, the lower surface of the upper check valve is fixedly connected with second circular block, the upper surface of the first circular block is equipped with slot, the outer surface of the second circular block is equipped with annular groove, the outer surface of the annular groove is sleeved with rubber pad, the second circular block is inserted in the inside of slot by annular groove.The application is formed by adopting annular rubber ring and outer rubber pad Double sealing redundancy structure, form two independent medium barrier defense lines, single sealing wear, leakage failure Another sealing can still normal isolation fluid, solve the security risk of traditional single sealing valve single point damage, substantially improve the safety level of pipeline medium conveying.

Description

Technical Field

[0001] This invention relates to the field of shut-off check valve technology, specifically to a high-safety shut-off check valve with a double-seal redundant structure. Background Technology

[0002] The shut-off check valve is a multi-purpose valve that combines the functions of a shut-off valve and a check valve. It achieves dual control through a non-fixed connection between the valve stem and the valve disc. When the valve stem presses down on the valve disc, it performs the shut-off function, and when it is raised, it automatically switches to the check function. This valve is suitable for pipeline systems that require the simultaneous installation of both types of valves.

[0003] Among them, a shut-off check valve with announcement number CN115789275A includes: a valve body; a valve disc assembly disposed within the valve body, the valve disc assembly including a valve disc; the sealing surface of the valve disc and the sealing surface of the valve body cooperate with each other to achieve a shut-off effect; the sealing surface of the valve disc and the sealing surface of the valve body are sealed by a soft seal; a valve stem disposed above the valve disc assembly, the valve stem driving the valve disc assembly to move up and down, the valve stem having an internal cavity; the inner diameter of the valve disc and the outer diameter of the valve stem are clearance-fitted to achieve up-and-down centering movement; and a spring disposed between the valve disc assembly and the valve stem, one end of the spring being fixed to the valve disc assembly, and the other end of the spring being fixed inside the valve stem.

[0004] However, existing conventional integrated shut-off check valves only have a single main seal to achieve shut-off and check, without graded independent redundant seal protection. Therefore, a single point of seal failure can easily lead to major safety hazards. Summary of the Invention

[0005] In view of the problems existing in the above-mentioned shut-off check valves, the present invention is proposed.

[0006] Therefore, the purpose of this invention is to provide a high-safety shut-off check valve with a double-seal redundant structure, which solves the problem that existing general shut-off check valves rely on a single set of seals to achieve shut-off and check-back, without graded independent redundant seal protection, thus posing a major safety hazard if a single point of seal failure occurs.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A high-safety shut-off check valve with a double-sealed redundant structure includes a lower check valve and an upper check valve. A first circular block is fixedly connected to the upper surface of the lower check valve, and a second circular block is fixedly connected to the lower surface of the upper check valve. A slot is formed on the upper surface of the first circular block, and an annular groove is formed around the outer surface of the second circular block. A rubber gasket is fitted onto the outer surface of the annular groove. The second circular block is inserted into the slot through the annular groove. Two connecting rods are symmetrically fixedly connected to the upper surfaces of the two first circular blocks, and two fixing blocks are symmetrically fixedly connected to the upper ends of the two second circular blocks. A fixing mechanism is provided between the two fixing blocks and the two connecting rods. A cavity is formed inside the two fixing blocks, and a spring mechanism is provided inside the two cavities. The two spring mechanisms are respectively matched with the corresponding fixing mechanisms.

[0008] Preferably, the fixing mechanism includes two movable blocks, two insert blocks, two screws, and two knobs. The lower ends of the two fixing blocks are provided with sliding grooves. The two movable blocks are slidably disposed inside the corresponding sliding grooves. The lower ends of the two sliding grooves are provided with slots. The two connecting rods are respectively inserted into the corresponding slots. One side of the two slots is provided with a groove. The two screws are respectively rotatably connected to the inside of the corresponding grooves. The two insert blocks are respectively threaded onto the outer surface of the corresponding screws. One end of the two screws passes through one side of the corresponding groove and is respectively fixedly connected to the corresponding knob.

[0009] Preferably, the rebound mechanism includes two moving rods, two springs, two stops, and two buttons. The two moving rods are respectively disposed inside the corresponding cavities. One end of each moving rod passes through one side of the corresponding cavity and is fixedly connected to the corresponding moving block. The two stops are respectively fixedly sleeved on the outer surface of the corresponding moving rod. The two springs are respectively slidably sleeved on the outer surface of the corresponding moving rod. Each button is fixedly connected to one end of the corresponding moving rod.

[0010] Preferably, two limiting grooves are symmetrically formed on the inner walls of the two grooves, and a limiting block is slidably arranged inside the two limiting grooves. Each limiting block is fixedly connected to the outer surface of the corresponding insert.

[0011] Preferably, the upper surfaces of the rubber pad and the second circular block are symmetrically provided with through holes, and each through hole is matched with a corresponding connecting rod.

[0012] Preferably, one end of each of the two connecting rods is provided with a fixing groove, and each fixing groove is matched with a corresponding insert block.

[0013] Preferably, a sealing groove is formed around the outer surface of both annular grooves, and an annular rubber ring is fitted inside the sealing groove.

[0014] Preferably, the two movable blocks are respectively fitted to the inner wall of the corresponding slide groove.

[0015] The technical effects and advantages provided by the present invention in the above technical solution are as follows: 1. This invention employs a double-seal redundant structure consisting of an annular rubber ring and an outer rubber gasket, forming two independent media barrier lines. Even if one seal wears or leaks and fails, the other seal can still effectively isolate the fluid, thus solving the safety hazard of leakage caused by a single point of damage in traditional single-seal valves and significantly improving the safety level of pipeline media transportation.

[0016] 2. This invention, through the built-in spring rebound component, can continuously provide upward pre-tightening force. Even if the sealing rubber wears and thins after long-term use, it can automatically compensate for the gap, maintain the sealing surface pressure, delay the sealing failure cycle, reduce the frequency of seal replacement, and reduce maintenance costs. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 For the present invention Figure 1 Side sectional view of the first and second circular blocks; Figure 3 For the present invention Figure 1 Enlarged schematic diagram of part A; Figure 4 For the present invention Figure 2 Enlarged schematic diagram of part B; Figure 5 For the present invention Figure 2 Enlarged schematic diagram of part C.

[0019] Explanation of reference numerals in the attached figures: 1. Lower check valve; 2. Upper check valve; 3. First circular block; 4. Second circular block; 5. Rubber pad; 6. Annular rubber ring; 7. Connecting rod; 8. Fixed block; 9. Moving block; 10. Insert block; 11. Screw; 12. Knob; 13. Moving rod; 14. Spring; 15. Stop block; 16. Button; 17. Limit block. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0021] This invention discloses a high-safety shut-off check valve with a double-sealed redundant structure.

[0022] This invention provides, for example Figure 1-5 The high-safety shut-off check valve with a double-sealed redundant structure shown includes a lower check valve 1 and an upper check valve 2. A first circular block 3 is fixedly connected to the upper surface of the lower check valve 1, and a second circular block 4 is fixedly connected to the lower surface of the upper check valve 2. A slot is formed on the upper surface of the first circular block 3, and an annular groove is formed around the outer surface of the second circular block 4. A rubber pad 5 is fitted onto the outer surface of the annular groove. The second circular block 4 is inserted into the slot through the annular groove. Two connecting rods 7 are symmetrically fixedly connected to the upper surfaces of the two first circular blocks 3, and two fixing blocks 8 are symmetrically fixedly connected to the upper ends of the two second circular blocks 4. A fixing mechanism is provided between the two fixing blocks 8 and the two connecting rods 7. A cavity is formed inside the two fixing blocks 8, and a spring mechanism is provided inside the two cavities. The two spring mechanisms are respectively matched with the corresponding fixing mechanisms. A sealing groove is formed around the outer surface of the two annular grooves, and an annular rubber ring 6 is fitted inside the sealing groove.

[0023] In actual use, the second circular block 4 is inserted into the slot of the first circular block 3. The annular rubber ring 6 in the annular groove forms the inner main seal, and the outer rubber pad 5 forms the outer auxiliary seal. The two independent sealing layers form redundant protection. When a single seal wears or leaks and fails, the other seal can still block the medium, thus preventing the safety hazard of leakage caused by the failure of a single seal.

[0024] like Figure 1-2 and Figure 4 As shown, the fixing mechanism includes two movable blocks 9, two insert blocks 10, two screws 11, and two knobs 12. The lower ends of the two fixing blocks 8 are provided with sliding grooves. The two movable blocks 9 are slidably disposed within the corresponding sliding grooves. The lower ends of the two sliding grooves are provided with slots. The two connecting rods 7 are respectively inserted into the corresponding slots. One side of each of the two slots is provided with a groove. The two screws 11 are rotatably connected to the interior of their respective grooves. The two insert blocks 10 are threaded onto the outer surfaces of their respective screws 11. One end of each screw 11 passes through one side of its corresponding groove and is fixedly connected to the corresponding knob 12. The inner walls of the two grooves are symmetrically provided with two limiting grooves. Limiting blocks 17 are slidably disposed within each of the two limiting grooves. Each limiting block 17 is fixedly connected to the outer surface of its corresponding insert block 10. One end of each of the two connecting rods 7 is provided with a fixing groove, and each fixing groove matches its corresponding insert block 10.

[0025] In actual use, rotating the knob 12 drives the screw 11 to rotate, and the screw drive drives the insert 10 to extend horizontally and lock into the fixing groove at the end of the connecting rod 7, thus rigidly locking the upper check valve 2 and the lower check valve 1; the limiting block 17 slides along the groove limiting groove, restricting the insert to only make linear translation, preventing the insert from deviating and falling out of the groove, and the locking is stable and without loosening.

[0026] like Figure 1-3 and Figure 5 As shown, the rebound mechanism includes two moving rods 13, two springs 14, two stops 15, and two buttons 16. The two moving rods 13 are respectively disposed inside the corresponding cavities. One end of each moving rod 13 passes through one side of the corresponding cavity and is fixedly connected to the corresponding moving block 9. The two stops 15 are respectively fixedly sleeved on the outer surface of the corresponding moving rod 13. The two springs 14 are respectively slidably sleeved on the outer surface of the corresponding moving rod 13. Each button 16 is fixedly connected to one end of the corresponding moving rod 13.

[0027] Press button 16, and then push moving rod 13. At this time, stop block 15 can squeeze spring 14 and compress it. Then, when moving block 9 is fixed, the rebound force of spring 14 can continuously drive connecting rod 7 to move upward, so that rubber pad 5 can still remain tight after wear after long-term use. The two moving blocks 9 respectively fit against the inner wall of the corresponding slide groove.

[0028] like Figure 1-2 As shown, the upper surfaces of the rubber pad 5 and the second circular block 4 are symmetrically provided with through holes, and each through hole is matched with the corresponding connecting rod 7.

[0029] The connecting rod 7 passes through the through holes of the rubber pad 5 and the second circular block 4 to achieve precise alignment of the upper and lower valve bodies and ensure complete fit of the annular sealing surface.

[0030] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A high-safety shut-off check valve with a double-sealed redundant structure, comprising a lower check valve (1) and an upper check valve (2), characterized in that, The upper surface of the lower check valve (1) is fixedly connected to a first circular block (3), and the lower surface of the upper check valve (2) is fixedly connected to a second circular block (4). The upper surface of the first circular block (3) is provided with a slot, and the outer surface of the second circular block (4) is provided with an annular groove. A rubber pad (5) is fitted on the outer surface of the annular groove. The second circular block (4) is inserted into the slot through the annular groove. The upper surfaces of the two first circular blocks (3) are symmetrically fixedly connected to two connecting rods (7), and the upper ends of the two second circular blocks (4) are symmetrically fixedly connected to two fixing blocks (8). A fixing mechanism is provided between the two fixing blocks (8) and the two connecting rods (7). The interior of the two fixing blocks (8) is provided with a cavity, and the interior of the two cavities is provided with a spring mechanism. The two spring mechanisms are respectively matched with the corresponding fixing mechanisms.

2. The high-safety shut-off check valve with double-seal redundant structure according to claim 1, characterized in that, The fixing mechanism includes two movable blocks (9), two insert blocks (10), two screws (11) and two knobs (12). The lower ends of the two fixing blocks (8) are provided with sliding grooves. The two movable blocks (9) are respectively slidably disposed inside the corresponding sliding grooves. The lower ends of the two sliding grooves are provided with slots. The two connecting rods (7) are respectively inserted into the corresponding slots. The side of the two slots is provided with grooves. The two screws (11) are respectively rotatably connected to the inside of the corresponding grooves. The two insert blocks (10) are respectively threaded onto the outer surface of the corresponding screws (11). The two screws (11) pass through one side of the corresponding grooves and are respectively fixedly connected to the corresponding knobs (12).

3. The high-safety shut-off check valve with double-seal redundant structure according to claim 1, characterized in that, The rebound mechanism includes two moving rods (13), two springs (14), two stops (15), and two buttons (16). The two moving rods (13) are respectively disposed inside the corresponding cavities. One end of the two moving rods (13) passes through one side of the corresponding cavity and is fixedly connected to the corresponding moving block (9). The two stops (15) are respectively fixedly sleeved on the outer surface of the corresponding moving rod (13). The two springs (14) are respectively slidably sleeved on the outer surface of the corresponding moving rod (13). Each button (16) is respectively fixedly connected to one end of the corresponding moving rod (13).

4. The high-safety shut-off check valve with double-seal redundant structure according to claim 2, characterized in that, Two limiting grooves are symmetrically opened on the inner walls of the two grooves, and a limiting block (17) is slidably arranged inside the two limiting grooves. Each limiting block (17) is fixedly connected to the outer surface of the corresponding insert (10).

5. The high-safety shut-off check valve with double-seal redundant structure according to claim 1, characterized in that, The upper surfaces of the rubber pad (5) and the second circular block (4) are symmetrically provided with through holes, and each through hole is matched with the corresponding connecting rod (7).

6. The high-safety shut-off check valve with double-seal redundant structure according to claim 1, characterized in that, One end of each of the two connecting rods (7) is provided with a fixing groove, and each fixing groove is matched with the corresponding insert (10).

7. The high-safety shut-off check valve with double-seal redundant structure according to claim 1, characterized in that, Both annular grooves have sealing grooves around their outer surfaces, and an annular rubber ring (6) is fitted inside the sealing grooves.

8. The high-safety shut-off check valve with double-seal redundant structure according to claim 2, characterized in that, The two movable blocks (9) respectively fit against the inner wall of the corresponding groove.

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